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AI robotics, robot learning, embodied AI, and engineering experience of Linji (Joey) Wang

Basics

Name Linji (Joey) Wang
Label AI Robotics & Systems Engineer | Curriculum Learning & Embodied RL
Email joewwang@outlook.com
Url https://linjiw.github.io/
Summary AI/robotics and systems engineer and Computer Science Ph.D. researcher specializing in automatic curriculum learning, deep reinforcement learning, and embodied-agent training. First/co-first author of two IROS 2025 papers, with systems experience spanning PostgreSQL query performance at AWS and C++/ROS 2 humanoid policy inference.

Skills

Robot Learning
Automatic Curriculum Learning
Deep Reinforcement Learning
Teacher–Student Learning
Reward Shaping
PPO
VAE Task Representations
Sim-to-Real
Robotics Systems
PyTorch
Isaac Gym
Isaac Lab
MuJoCo
ROS 2
ONNX Runtime
Navigation
Quadruped Locomotion
Off-Road Mobility
Humanoid Policy Inference
Programming
Python
C
C++
Bash
Database Systems
PostgreSQL
Database Internals
Query Processing
Join Optimization
Performance Analysis
Software and Experimentation
AWS
Streamlit
Statistical Hypothesis Testing
Docker
Git / CI-CD

Experience

  • 2023.08 - Present

    Fairfax, VA

    Graduate Research Assistant — Robot Learning
    RobotiXX Lab, George Mason University
    Automatic curriculum learning and deep reinforcement learning for embodied robots, advised by Dr. Xuesu Xiao
    • Developed GACL, an automatic curriculum-learning framework using VAE task representations, performance-history tracking, and target-domain grounding; trained PPO agents in 128 parallel Isaac Gym environments and improved success by 6.8% on wheeled navigation and 6.1% on quadruped locomotion versus state-of-the-art methods (first author, IROS 2025)
    • Co-developed Reward Training Wheels, a teacher–student framework for proficiency-conditioned auxiliary-reward adaptation; in simulation, improved off-road mobility by 122.62% and reached the same performance threshold 3x faster; sim-trained policies achieved 5/5 physical trials versus 2/5 (co-first author, IROS 2025)
    • Third author on Moving Through Clutter (2026), a VR data-collection and evaluation framework for scene-aware humanoid locomotion with 348 trajectories across 145 3D scenes
    • Developing a C++/ROS 2 policy-inference stack for Unitree G1 with paired ONNX residual/base policies, metadata-driven observation construction, temporal history, normalization, and Isaac Lab–MuJoCo parity diagnostics
    • Co-authored RL-based Adaptive Dynamics Planning (4th author, ICRA 2026) and Decremental Dynamics Planning (3rd author, IROS 2025); the DDP-based RobotiXX system placed 2nd in both the simulation qualifier and physical finals of the 2025 BARN Challenge
  • 2026.05 - 2026.08
    Software Development Engineer Intern — Amazon Aurora PostgreSQL
    Amazon Web Services (AWS)
    Aurora PostgreSQL query-execution performance and compatibility
    • Contributed to Adaptive Join for Amazon Aurora PostgreSQL, developing mechanisms that adjust join execution to improve query performance
    • Worked in the PostgreSQL-based database engine codebase in C on database internals, join processing, performance analysis, and compatibility improvements
  • 2025.05 - 2025.08

    Bellevue, WA

    Software Development Engineer Intern — RDS Proxy
    Amazon Web Services (AWS)
    Statistical performance testing and visualization infrastructure
    • Built a Streamlit application that unified multi-region RDS Proxy performance comparisons and regression investigation
    • Implemented regression detection using Welch's t-test, power analysis, and Bonferroni correction; integrated CloudWatch metrics into reproducible performance dashboards
    • Developed adaptive test selection with Thompson sampling and Bayesian optimization to prioritize informative test configurations
  • 2022.01 - 2023.05

    Pittsburgh, PA

    Research Assistant — 3D Perception and AR
    Computational Engineering and Robotics Lab, Carnegie Mellon University
    Deep learning for 3D augmented-reality scene completion
    • Built an AR scene-inpainting pipeline using GAN image completion plus RANSAC and DBSCAN point-cloud segmentation
  • 2021.09 - 2021.12

    Pittsburgh, PA

    Research Assistant
    Biorobotics Lab, Carnegie Mellon University
    Computer vision for recycled-material classification
    • Built a CNN and OpenCV pipeline for real-time recycled-paper classification

Education

  • 2023.08 - Present

    Fairfax, VA

    Ph.D. in Computer Science
    George Mason University
    Research focus: curriculum learning and reinforcement learning for robotics
    • Advanced Machine Learning
    • Deep Learning
    • Reinforcement Learning
    • Computer Vision
  • 2021.09 - 2023.05

    Pittsburgh, PA

    M.S.
    Carnegie Mellon University
    Mechanical Engineering
    • GPA: 3.94/4.0
    • Machine Learning
    • Deep Learning
    • Computer Vision
    • Deep Reinforcement Learning and Control
  • 2016.09 - 2021.05

    Cincinnati, OH

    B.S.
    University of Cincinnati
    Mechanical Engineering
    • Magna cum laude

Publications

Projects

  • 2025.08 - Present
    Humanoid Policy Inference Prototype
    Ongoing C++/ROS 2 prototype for Unitree G1 motion-policy inference
    • Added paired ONNX residual/base inference, metadata-driven observation assembly, history buffering, normalization, and Isaac Lab–MuJoCo parity diagnostics
    • Documented validation gates explicitly; no physical-deployment claim is made

Awards

Teaching

Languages

English
Fluent
Chinese
Native

Interests

Embodied AI
Curriculum Learning
Reinforcement Learning
Humanoid Locomotion
Scene-Aware Whole-Body Control